78227289 has 24 divisors (see below), whose sum is σ = 133922880. Its totient is φ = 44700336.

The previous prime is 78227269. The next prime is 78227323. The reversal of 78227289 is 98272287.

It is a happy number.

It is not a de Polignac number, because 78227289 - 2⁸ = 78227033 is a prime.

It is a super-2 number, since 2×78227289² = 12239017488579042, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78227249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21294 + ... + 24695.

It is an arithmetic number, because the mean of its divisors is an integer number (5580120).

Almost surely, 2^78227289 is an apocalyptic number.

It is an amenable number.

78227289 is a deficient number, since it is larger than the sum of its proper divisors (55695591).

78227289 is an equidigital number, since it uses as much as digits as its factorization.

78227289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46011 (or 45999 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 78227289 is about 8844.6192117015. The cubic root of 78227289 is about 427.6804778135.

The spelling of 78227289 in words is "seventy-eight million, two hundred twenty-seven thousand, two hundred eighty-nine".